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Sentence-T5: Scalable Sentence Encoders from Pre-trained Text-to-Text Models

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arxiv 2108.08877 v3 pith:TYAIG6XL submitted 2021-08-19 cs.CL

Sentence-T5: Scalable Sentence Encoders from Pre-trained Text-to-Text Models

classification cs.CL
keywords sentenceembeddingsmodelstasksencoder-decoderachievesbenchmarklanguage
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We provide the first exploration of sentence embeddings from text-to-text transformers (T5). Sentence embeddings are broadly useful for language processing tasks. While T5 achieves impressive performance on language tasks cast as sequence-to-sequence mapping problems, it is unclear how to produce sentence embeddings from encoder-decoder models. We investigate three methods for extracting T5 sentence embeddings: two utilize only the T5 encoder and one uses the full T5 encoder-decoder model. To support our investigation, we establish a new sentence representation transfer benchmark, SentGLUE, which extends the SentEval toolkit to nine tasks from the GLUE benchmark. Our encoder-only models outperforms Sentence-BERT and SimCSE sentence embeddings on both SentEval and SentGLUE transfer tasks, including semantic textual similarity (STS). Scaling up T5 from millions to billions of parameters is found to produce consistent further improvements. Finally, our encoder-decoder method achieves a new state-of-the-art on STS when using sentence embeddings. Our models are released at https://tfhub.dev/google/collections/sentence-t5/1.

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